with a grim smile. "We don't want a tumble if we can help it."
"It is a grand sport," answered the head of the college. "Before long I expect to see aeroplanes in constant use."
"Wouldn't you like to go up with us some day, Doctor?" questioned Tom, slyly.
"Well—er—perhaps, Thomas. But not just yet. I wish er to see them more in general use first." And then the doctor bowed the students out.
The boys lost no time in preparing for the trip to Plank ville. After a somewhat hasty lunch they put on their flying suits and then went down to where the Dartaway was housed, in one of the buildings attached to the gymnasium.
"Looks to be all right," remarked Dick, after an inspection of the flying machine, and while Sam and Tom were filling the gasoline tank and the oil distributor.
The engine was tried out for a minute, and found to be in perfect order. As usual, as soon as the explosions of the motor were heard, a crowd commenced to gather, to see the start of the flight.
"Wish you luck!" cried Stanley.
"Say, look out that you don't forget how to
